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• W2316396129 endingPage "2527" @default.
• W2316396129 startingPage "2514" @default.
• W2316396129 abstract "Aims: S-nitrosylation and S-glutathionylation, redox-based modifications of protein thiols, are recently emerging as important signaling mechanisms. In this study, we assessed S-nitrosylation-based regulation of Janus-activated kinase 2/signal transducer and activator of transcription 3 (JAK2/STAT3) pathway that plays critical roles in immune/inflammatory responses and tumorigenesis. Results: Our studies show that STAT3 in stimulated microglia underwent two distinct redox-dependent modifications, S-nitrosylation and S-glutathionylation. STAT3 S-nitrosylation was associated with inducible nitric oxide synthase (iNOS)-produced nitric oxide (NO) and S-nitrosoglutathione (GSNO), whereas S-glutathionylation of STAT3 was associated with cellular oxidative stress. NO produced by iNOS or treatment of microglia with exogenous GSNO inhibited STAT3 activation via inhibiting STAT3 phosphorylation (Tyr705). Consequently, the interleukin-6 (IL-6)-induced microglial proliferation and associated gene expressions were also reduced. In cell-free kinase assay using purified JAK2 and STAT3, STAT3 phosphorylation was inhibited by its selective preincubation with GSNO, but not by preincubation of JAK2 with GSNO, indicating that GSNO-mediated mechanisms inhibit STAT3 phosphorylation through S-nitrosylation of STAT3 rather than JAK2. In this study, we identified that Cys259 was the target Cys residue of GSNO-mediated S-nitrosylation of STAT3. The replacement of Cys259 residue with Ala abolished the inhibitory role of GSNO in IL-6-induced STAT3 phosphorylation and transactivation, suggesting the role of Cys259 S-nitrosylation in STAT3 phosphorylation. Innovation: Microglial proliferation is regulated by NO via S-nitrosylation of STAT3 (Cys259) and inhibition of STAT3 (Tyr705) phosphorylation. Conclusion: Our results indicate the regulation of STAT3 by NO-based post-translational modification (S-nitrosylation). These findings have important implications for the development of new therapeutics targeting STAT3 for treating diseases associated with inflammatory/immune responses and abnormal cell proliferation, including cancer. Antioxid. Redox Signal. 20, 2514–2527." @default.
• W2316396129 created "2016-06-24" @default.
• W2316396129 creator A5022548683 @default.
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• W2316396129 date "2014-06-01" @default.
• W2316396129 modified "2023-09-27" @default.
• W2316396129 title "STAT3 Regulation by S-Nitrosylation: Implication for Inflammatory Disease" @default.
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• W2316396129 doi "https://doi.org/10.1089/ars.2013.5223" @default.
• W2316396129 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4026100" @default.
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